JPH07155627A - Vertical grinder - Google Patents

Abstract

PURPOSE:To increase the control width of the particle size of a product and to smooth the flow of the coarse powder falling to a grinding table from a classifier and the flow of the hot gas rising through the gap between the outer periphery of the grinding table and the body. CONSTITUTION:In a vertical grinder wherein matter to be ground is ground on a rotary grinding table 2 by a roller 3 and the ground matter is fed to a classifier 4 by rising hot gas, the ring 4 being in contact with the inner surface of the body 10 and forming an annular gap between the outer periphery of the grinding table 2 and the ring 4 is provided to the upper part of the grinding table 2. Further, the gap is changed by controlling the position of the ring 4 up and down and the flow velocity of hot gas is changed to change the particle size of the particles carried to the classifier 6. The angle of inclination of the upper surface of the ring 4 is set to the angle of repose of treated matter to prevent the accumulation of the coarse powder falling to the grinding table 2 from the classifier 6 on the ring and the angle of inclination of the rear surface of the ring is set to 45 deg. or more with respect to horizontality and the hot gas blown up through the gap 5 is allowed to smoothly flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical crusher for crushing coal and various other raw materials.

[0002]

2. Description of the Related Art In a conventional vertical crusher, an object to be crushed put on a crushing table which is rotated from a crushing object supply pipe is compressed and crushed by a crushing roller and then crushed as a crushed object in the outer peripheral direction of the crushing table. Is released to. The crushed material thus compressed and crushed and discharged toward the outer circumference of the crushing table is
It is introduced into the classifier along with an upward flow of hot gas such as hot air introduced from the hot gas introduction pipe and blown up from the outer periphery of the crushing table, where the coarse particles fall onto the crushing table and are crushed again. The particles having a predetermined particle size pass through the classifier and are conveyed as a product to the outside of the crusher.

[0003]

In the conventional vertical crusher as described above, the opening and rotation speed of the classifier were adjusted to change the particle size of the product. I couldn't cope enough when I wanted to.

To change the product particle size largely, the gas flow rate in the crusher may be changed. However, in the conventional vertical crusher, the flow rate must be changed in order to change the gas flow rate.
The range of change was too small to adequately cope with it.

The present invention is intended to provide a vertical crusher capable of solving the above problems.

[0006]

The vertical crusher of the present invention comprises:
The following measures were taken. (1) The material to be ground is supplied onto a grinding table that rotates in the body around a vertical axis, pressed by rollers to grind it, and then passes through an annular gap between the outer circumference of the grinding table and the body. The pulverized product is conveyed to the classifier by the hot gas rising in the body, and the coarse and fine powders are sorted by the same classifier, and the coarse powder is repeatedly returned to the pulverization table again to obtain the powder. In a mold crusher, an orifice ring is provided at the upper part of the crushing table that inscribes in the body and forms an annular gap between the crushing table and the outer circumference of the crushing table, and an annular gap between the ring and the outer circumference of the crushing table is provided. The position of the ring can be adjusted up and down for adjustment. (2) In the vertical crusher of (1) above, the upper surface on the inner diameter side of the ring is cut off at an angle equal to or greater than the repose angle of the crushed material, and the lower surface on the inner diameter side of the ring is inclined at an angle of 45 ° or more with respect to the horizontal. Characterized by being cut off.

[0007]

In the invention (1) described above, the area of the annular gap between the outer circumference of the crushing table and the ring is adjusted by moving the position of the ring inscribed in the body up and down. As a result, the flow velocity of the hot gas blown up through the gap becomes variable, and the particle size carried from the crushing table to the classifier can be controlled. Further, by changing the flow rate of the hot gas in addition to the adjustment of the gap for blowing the hot gas, the change width of the hot gas blowing velocity can be made larger than in the conventional case, so that the control range of the particle diameter can be increased. Further, by changing the setting of the classifier in addition to the adjustment of the area of the gap, the control width of the particle size can be increased as compared with the conventional case.

In the present invention of (2) above, in addition to the above-mentioned effects of the present invention of (1), since the upper surface of the ring is cut off at an angle equal to or greater than the repose angle of the pulverized material, the pulverized material is deposited on the ring. Do not let it flow down smoothly on the crushing table. Further, since the lower surface of the ring is cut off at an angle of 45 ° or more with respect to the horizontal, the hot gas flows smoothly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. At the lower part of the vertical cylindrical body 10 of the vertical crusher according to this embodiment, a crushing table 2 that rotates about a vertical axis is arranged. At the center of the upper part of the body 10, a crushed object supply pipe 1 is installed which penetrates the top plate 7 from the outside and extends downward in the body 10 and opens above the crushing table 2. Reference numeral 3 is a crushing roller for pressing and crushing the crushed object on the crushing table 2, and 6 is a classifier provided around the crushed object supply pipe 1.

A portion 2 above the outer circumference of the crushing table 2.
a is cut off so as to incline diagonally outward from the upper side to the lower side, and an annular gap is formed between the outer periphery of the crushing table 2 and the body 10, and the hot gas passes through this gap. The part in the body 10 between the upper crushing table 2 and the classifier 6 which has risen up and flowed through rises and flows.

Reference numeral 4 denotes an orifice ring which is arranged outside the upper portion of the crushing table 2 and inscribes in the body 10.
As shown in FIG. 2, the ring 4 is slanted upward at an angle δ of 45 ° or more with the upper surface 4a on the inner diameter side cut off obliquely downward at an angle θ equal to or greater than the repose angle of the pulverized material. It has a lower surface 4b on the inner diameter side that is cut off toward and has a triangular cross-sectional shape that projects toward the crushing table 2, and the portion where the inner diameter forms the minimum angle is slightly above the upper surface of the crushing table 2. positioned. Further, the lower surface 4b faces the portion 2a of the crushing table 2 and forms an annular gap 5 therebetween. Furthermore, the ring 4 is suspended by a suspension rod 8 that penetrates the top plate 7,
The vertical position of the ring 4 can be adjusted by changing the length of the suspending rod 8 by means of the adjusting bolt 9 on the outside of the top plate 7, so that the annular clearance 5 can be adjusted during operation. It has become.

In the present embodiment having the above-described structure, the crushed object put on the crushing table 2 rotating from the crushed object supply pipe 1 is pressed and crushed by the crushing roller 3 and is then crushed. It is discharged toward the outer circumference of the crushing table 2.

The crushing table 2 thus compressed and crushed
The pulverized material discharged from the outer periphery of the blasting machine blows up into the annular gap 5 between the crushing table 2 and the orifice-shaped ring 4 which is inscribed in the body 10 of the crusher and is arranged outside the upper part of the crushing table 2. It is introduced into the classifier 6 along with an upward flow of hot gas such as hot air. The pulverized material introduced into the classifier 6 is subjected to a classification action to be classified into coarse powder and fine powder, and the fine powder passes through the classifier 6 and is taken out of the crusher as a product. It is dropped onto 2 and is crushed again by the crushing roller 3.

Since the ring 4 is suspended from the top plate 7 of the crusher by the suspension rod 8 penetrating the top plate 7, the suspension rod 8 of the suspension rod 8 is adjusted by the adjusting bolt 9 on the outside of the top plate 7. Ring 4 by changing the length
The vertical position of the ring is changed to the ring 4 and the grinding table 2.
The gap 5 between the outer peripheral portion 2a and the outer peripheral portion 2a can be changed during operation. That is, it is possible to change the blow-up flow velocity on the outer periphery of the crushing table 2 during operation. This makes it possible to control the particle size of the crushed material conveyed from the crushing table 2 to the classifier 6. Further, by changing the flow rate of the hot gas in addition to adjusting the gap 5, it is possible to increase the change width of the blowing speed of the hot gas and increase the control width of the particle size of the product.
Further, by changing the setting of the classifier 6 in addition to the adjustment of the gap 5, the control range of the particle size of the product can be increased.

Further, since the upper surface 4a of the ring 4 is inclined obliquely downward at an angle θ which is equal to or greater than the repose angle of the crushed material, the crushed material falling from the classifier 6 does not accumulate on the ring 4. This can be smoothly dropped on the crushing table 2. Furthermore, since the lower surface 4b of the ring 4 also forms an angle δ of 45 ° or more with respect to the horizontal and obliquely upward, the hot gas can smoothly flow through the gap 5.

[0016]

According to the present invention as set forth in claim 1, the position of the ring provided inside the body of the vertical crusher is adjusted up and down to form an annular ring between the ring and the outer periphery of the crushing table. By adjusting the gap, the flow rate of the hot gas flowing through the gap can be changed, so the particle size of the particles conveyed from the crushing table to the classifier can be controlled, and the amount of hot gas and the classifier can be controlled. The particle size of the product can be changed without changing the setting. In addition, by changing the blowing gas flow rate, changing the hot gas flow rate, and changing the setting of the classifier, it is possible to make the range of adjustment of the particle size larger than in the past.

According to the present invention described in claim 2, in addition to the effect of the present invention described in claim 1, coarse particles returned from the classifier to the grinding table are prevented from accumulating on the ring. The coarse powder returned from the classifier to the crushing table can be smoothly dropped, and the hot gas rising in the gap between the ring and the outer periphery of the crushing table can be smoothly flowed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged view of part A of FIG.

[Explanation of symbols]

 1 crushed material supply pipe 2 crushing table 3 crushing roller 4 ring 4a upper surface of ring 4b lower surface of ring 5 gap 6 classifier 7 top plate of crusher 8 suspension rod 9 adjusting bolt 10 body of crusher

Claims (2)

[Claims] 1. An object to be crushed is supplied onto a crushing table that rotates in a body about a vertical axis and pressed by a roller to crush it, and an annular gap between the outer periphery of the crushing table and the body is provided. The pulverized material is conveyed to the classifier by the hot gas passing through the body, and the coarse powder and the fine powder are sorted by the same classifier, and the coarse powder is repeatedly returned to the pulverization table to form the powder. In the vertical crusher to be obtained, an orifice ring which is inscribed in the body of the crushing table and forms an annular gap with the outer circumference of the crushing table is provided, and an annular ring between the ring and the outer circumference of the crushing table is provided. A vertical crusher characterized in that the position of the ring can be adjusted up and down so as to adjust the clearance. 2. The upper surface on the inner diameter side of the ring is cut off at an angle equal to or greater than the repose angle of the pulverized material, and the lower surface on the inner diameter side of the ring is cut off at an angle of 45 ° or more with respect to the horizontal. The vertical crusher according to 1.